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At: geom series step 1 2 1

1. q:
2. n:
3. n+1 = 0
4. n+1-1 = n

(qn+1-1)+(qn+1-1) = (qn)+(qn)

By: HypSubst 4 0

Generated subgoals:

1 (qn)+(qn) = (qn)+(qn)
25. z:
(qz)+(qz) = (qn)+(qn) Prop


About:
equaladdsubtractnatural_numberintmemberprop